Tough choice
You said you were thrilled when you got the offer of the job with the air taxi company. Were you thrilled when you got the offer of the job (not aviation related) you are in now? Would you be thriiled to advance and excell in your current position or a similar field?
Its obvious you are passionate about flying, havin made the considerable sacrifices to put 600TT in the log book.
Ask yourself the above questions a few times, but whatever happens, dont have any regrets (Easier said than done).
Best of luck....441